How Many Cubic Inches In A Gallon. 100 cubic inches to us gallon = 0.4329 us gallon. ›› quick conversion chart of cubic inches to gallon.
In other words, say the water level in your (48″ x 18″ x 20″) 75 gallon tank drops one inch when the power goes out. To convert a gallon measurement to a cubic foot measurement, multiply the volume by the conversion ratio. 10 cubic inches to gallon = 0.04329 gallon.
